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TREE SURGERY DEFINITIONS
Common reasons for crown thinning are:
Reduce wind resistance
A once-only operation on species that are known to produce large amounts of epicormic growth
Crown lifting is the removal of the lowest branches and/or preparing of lower branches for future removal. Crown lifting on older, mature trees should be avoided or restricted to secondary branches or shortening of primary branches rather than the whole removal.
Crown reduction may be used to reduce mechanical stress on individual branches or the whole tree, to make the tree more suited to its immediate environment or to reduce the effects of shading and light loss. Crown reduction cuts should be as small as possible and in general not exceed 100 mm diameter unless there is an overriding need to do so. Reductions should be specified by actual measurements, where possible, and reflect the finished result, but may also refer to lengths of parts to be removed to aid clarity, e.g. ‘crown reduce in height by 2.0 m and lateral spread by 1.0 m, all round, to finished crown dimensions of 18 m in height by 11 m in spread (all measurements approximate.)’. Not all species are suitable for this treatment, and crown reduction should not be confused with ‘topping’, an indiscriminate and harmful treatment.
Felling is the process of downing individual trees either as a whole, or with the top dismantled the pole is then felled again as a whole.